Atoms
.... particles through
various experiments changing the position of the charged plates. By
changing the plates, he discovered he could also change the point at which
the particles would hit a florescent screen at the end of the tube. He
decided that the ray was made up of particles with a negative charge. He
named these particles electrons. This discovery also showed that atoms had
a substructure. Thomson made a model showing his idea for the atom. His
model, called the raisin dough model had positive and negative particles
imbedded into a positive atom.
Other particles in the atoms nucleus were discovered after the
electron thank .....
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Nuclear Weapons
.... the U.S.
dropped atomic bombs on Hiroshima and on Nagasaki three days later to force
Japan to surrender. The explosion produces great amounts of heat, a shock
wave, and intense neutron and gamma radiation. The region of the explosion
becomes radioactively contaminated, and wind-borne radioactive products may
be deposited elsewhere.
The hydrogen bombs an explosive weapon of enormous destructive
powercaused by the fusion of the nuclei of various hydrogen isotopes in the
form of helium nuclei. A hydrogen bomb is also known as a thermonuclear
bomb. The structure of the bomb is an atomic bomb is surrounded by a layer
of lit .....
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Hail
.... 54).
Hail can be extremely dangerous. It can break windows, damage
roofs, dent cars, injure and even kill people! Crops are greatly affected.
Hail causes around two hundred million dollars in damage a year. That's a
lot of money. When the wind is blowing hailstones are at their worst.
The most common places to see hail is in Texas, through the Great
Plains and up into Alberta, Canada. Areas in the east of the high plains
tend to have most of their hail in the spring. Southeastern Wyoming,
western Nebraska, and eastern Colorado also have massive amounts of hail
falling mostly during the summer (Merit S .....
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How Earthquakes Are Caused
.... boundaries. After much time, pressure
builds up as the molten material churns in its chamber. It gets hotter, and
as we know from the laws of physics, heat rises due to its kinetic energy.
So, as the pressure get to be too much, the molten material goes up.
As you may already know, molten material mostly does not just come
out of a big hole in the ground. It comes out of mountains. When the molten
material is pushing up through to the surface of the land, the earth
doesn't just move apart to let it through. The igneous rock that the
lithosphere of comprised of gets pushed up with the material, forming the
mountain you see .....
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Oxygen
.... of combining with most elements.
It is essential for respiration of all plants and animals and for
practically all combustion.
history of oxygen
Leonardo da Vinci suggested that air consists of at least two
different gases. Before then, air was felt to be an element in its own
right. He was also aware that one of these gases supported both flames and
life. Oxygen was prepared by several workers before 1772 but these workers
did not recognise it as an element. Joseph Priestley is generally credited
with its discovery (who made oxygen by heating lead or mercury oxides), but
Carl Wilhelm Scheele also reported it indep .....
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Rabbits
.... hind legs that enable it to hop 43 miles per hour (69 km/h), as
fast as a race horse. Lagomorphs must be able to hop about quickly to
escape from predators. Another lagomorph, the pika, dwells among the craggy
mountain slopes of Asia and North America. In late summer the little pika
might be seen guarding a stack of freshly cut hay with determination. A
pika bites off tender shoots of grass and plants and piles them up into
stacks 2 to 3 feet (60 to 90 cm) high. The hot summer sun dries the grass
and plants and preserves them for winter consumption. Measuring only 6 6o
10 inches (15 to 25 cm) in length and weighing 6 to 14 oun .....
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Biology
.... are located near the tip. Fertilization occurs when outside
moisture is present and the sperm from the antheridia swim to the eggs of the
archegonia. A zygote is formed on the prothallus and a new sporophyte grows.
4. Flowering plants have unique characteristics that help them survive.
One is the flower itself that contains the reproductive structures. The color
of the flower helps because it may attract birds and insects that spread the
plants pollen which diversify the later generation of plants. Flowers also
produce fruits that protect their seeds and disperses them with the help of
fruit eating animals.
5. Fungi, An .....
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The African Penguin
.... A long
time ago the early European settlers at the Cape of Good Hope realized that
penguin eggs were good for eating and over the years millions of penguin
eggs have been collected greatly reducing the population of the African
penguin species, and even to make things worse they started the practice of
destroying any incubated eggs so that there would be fresh ones when these
collectors paid their next visit. Another reason the African Penguin
population was decreasing is Guano on the islands on which the penguins
breed. It became the basis for a new industry and workers removed
thousands of pounds. This disturbed the birds and .....
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Nature Vs. Nurture
.... believe that one's immediate family, rather than society, has a
greater influence on gender roles. For example, girls who group up without
a mother or older sisters tend to be less feminine because all they have
are male role models. Another example of how the family influences gender
roles is whether or not the mother works. A housewife who believes that
the home is where she belongs tends to influence her daughter in thinking
the same way. One of my close friend's mother is a housewife and my friend
wishes to be one herself. Parents are one of the biggest factors in
determining gender roles for children. They tea .....
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Nuclear Power
.... is "totally inappropriate
for government." I don't know if Dr. Gofman understands that we are kind of
running out of energy sources, and until we better develop things like
solar power to make them more useful and economical, we may need energy
sources like nuclear power in the very near future. Next he tries to
convince the public that the nuclear supporters and groups like BEIR
(Biological Effects of Ionizing Radiation) lied about their findings of the
number of deaths caused by radiation to be zero. He goes through a x-ray
radiation experiment where he finds the data of the BEIR committee to be
off, but still doesn't prove tha .....
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Asteroid Defense
.... very lucky with where asteroids have hit our earth. Back in 1908
in the Tunguska region of Siberia, an object from space hit there causing miles
of forest to be devastated. If that same object had hit New York, it would have
probably been like a 20 megaton bomb going off in Times Square. That would have
completely altered history. What makes it worse is that it is thought that a
small comet hit in Tunguska. What if a huge comet had hit there? These
examples are very good reasons why I think that humankind needs to come up with
a way to stop asteroids or any other type of object that could kill off all life
on earth.
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The Giant Anteater
.... open ant nest
before eating. Then it flits its long tongue and literally licks up the
ants. The anteater precedes to rip oben a termite or ant hill with its
clawed hand and work its tubular snout down into the heart of the colony,
trapping the insects on its tongue's sticky coating (Encarta ‘98). The
anteater also uses the claws as a defense mechinism. The natural predators
of the giant anteater are the jaguar and the puma. Anteaters defend
themselves against the large cats by using their front four-inch-long claws.
The puma and jaguar are careful in their attacks because an embrace by the
giant anteater's powerful forelimbs .....
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